Clip-on calculator

Details Clip-on calculator Clip-on calculator

1991-02-08

1994-07-19

Holtje, Nelson C.

Printing and office machinery

Typewriter or calculator

Calculator

D18 2, D19 37, D19 65

Patent

active

D03488977

REFERENCES:
patent: 4075702 (1978-02-01), Davies
patent: 4224675 (1980-09-01), Pinkerman
patent: 4404643 (1983-09-01), Ojima et al.
patent: 4768648 (1988-09-01), Glass
patent: 5093760 (1992-03-01), Bedol
Hong Kong Ent., Nov. 1987, pp. 114, Wisdom Chain Ltd. Calculator.
Hong Kong Ent., Mar. 1989, p. 565, WT-318, upper right of page.
Hong Kong Ent., Mar. 1989, p. 565, WT-389C, bottom left of page.

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